Microbiology A patient presents with a painless ulcer on his penis. A Wasserman test is done and is positive. Wasserman reaction is an example of _ A Complement fixation B Precipitation C Neutralization D Agglutination 💡 Explanation A patient presents with a painless ulcer on his penis. A Wasserman test is done and is positive. Wasserman reaction is an example of _ ✓ Correct Answer: A. Complement fixation